# Understanding Transformer Autograd by Building It Manually in PyTorch [P] > Source: > Published: 2026-10-27 21:07:13+00:00 I’ve uploaded a minimal, self-contained implementation of manual autograd for a transformer-based classifier in PyTorch. It can help build intuition for what autograd is doing under the hood and is a useful hands-on reference for low-level differentiation in Transformer models, such as writing custo